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| |
| <section id="raw-packet-socket-support"> |
| <h1>“Raw” packet socket support<a class="headerlink" href="#raw-packet-socket-support" title="Permalink to this heading"></a></h1> |
| <p>Packet sockets (<code class="xref c c-macro docutils literal notranslate"><span class="pre">AF_PACKET</span></code>) allow receiving and transmitting frames |
| without a transport protocol in between. Frames received are copied into a |
| packet socket tap before they enter the network. Data written into a packet |
| socket will bypass the network altogether and be placed in the transmission |
| buffer of the network interface driver.</p> |
| <section id="configuration-options"> |
| <h2>Configuration Options<a class="headerlink" href="#configuration-options" title="Permalink to this heading"></a></h2> |
| <dl class="simple"> |
| <dt><code class="docutils literal notranslate"><span class="pre">CONFIG_NET_PKT_PREALLOC_CONNS</span></code></dt><dd><p>Number of preallocated packet connections (all tasks).</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CONFIG_NET_PKT_ALLOC_CONNS</span></code></dt><dd><p>Dynamic memory allocations for packet connections.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">CONFIG_NET_PKT_MAX_CONNS</span></code></dt><dd><p>Maximum number of packet connections.</p> |
| </dd> |
| </dl> |
| </section> |
| <section id="usage"> |
| <h2>Usage<a class="headerlink" href="#usage" title="Permalink to this heading"></a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">sockaddr_ll</span><span class="w"> </span><span class="n">addr</span><span class="p">;</span> |
| <span class="kt">uint8_t</span><span class="w"> </span><span class="n">buffer</span><span class="p">[</span><span class="n">BUFSIZE</span><span class="p">];</span> |
| <span class="kt">int</span><span class="w"> </span><span class="n">sd</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">socket</span><span class="p">(</span><span class="n">AF_PACKET</span><span class="p">,</span><span class="w"> </span><span class="n">SOCK_RAW</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span><span class="w"> </span><span class="cm">/* Create a packet socket */</span> |
| |
| <span class="n">addr</span><span class="p">.</span><span class="n">sll_family</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">AF_PACKET</span><span class="p">;</span> |
| <span class="n">addr</span><span class="p">.</span><span class="n">sll_ifindex</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">if_nametoindex</span><span class="p">(</span><span class="s">"eth0"</span><span class="p">);</span> |
| <span class="n">bind</span><span class="p">(</span><span class="n">sd</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="n">FAR</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">sockaddr</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="o">&</span><span class="n">addr</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">addr</span><span class="p">));</span><span class="w"> </span><span class="cm">/* Bind to device */</span> |
| |
| <span class="n">recv</span><span class="p">(</span><span class="n">sd</span><span class="p">,</span><span class="w"> </span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span><span class="w"> </span><span class="cm">/* read(sd, buffer, sizeof(buffer)); */</span> |
| <span class="n">send</span><span class="p">(</span><span class="n">sd</span><span class="p">,</span><span class="w"> </span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span><span class="w"> </span><span class="cm">/* write(sd, buffer, sizeof(buffer)); */</span> |
| |
| <span class="n">close</span><span class="p">(</span><span class="n">sd</span><span class="p">);</span><span class="w"> </span><span class="cm">/* Close the socket */</span> |
| </pre></div> |
| </div> |
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